Dinosaurs lived long ago in prehistoric times. Prehistoric means before anyone lived to write down information about what was happening. All dinosaurs lived in prehistoric times. But not all dinosaurs lived during the same period.

Stegosaurus

Sabertooth Cat

Tyrannosaurus Rex

Triceratops

Diet: Leaves and plantsHome: Forests and swampsSize: As long as a school busSpecial Feature: Bony plates on its backMeans of Protection: Sharp tail spikes

Diet: Other animalsHome: Grasslands and forestsSize: About the size of a lionSpecial Feature: Two long, sharp teethMeans of Protection: Sharp teeth and running speed

Diet: Other animals alive or deadHome: western North AmericaSize: Tall as an elephantSpecial Feature: Long tail for balanceMeans of Protection: Big, sharp teeth and sharp claws

Diet: Green plantsHome: North American plainsSize: About as long as a school busSpecial Feature: Three horns and a large
neck frillMeans of Protection: Two long horns above its eyes